| /* |
| * Copyright (c) 2016 Cisco and/or its affiliates. |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at: |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef _vnet_tcp_h_ |
| #define _vnet_tcp_h_ |
| |
| #include <vnet/vnet.h> |
| #include <vnet/ip/ip.h> |
| #include <vnet/tcp/tcp_packet.h> |
| #include <vnet/tcp/tcp_timer.h> |
| #include <vnet/session/transport.h> |
| #include <vnet/session/session.h> |
| #include <vnet/tcp/tcp_debug.h> |
| |
| #define TCP_TICK 0.001 /**< TCP tick period (s) */ |
| #define THZ (u32) (1/TCP_TICK) /**< TCP tick frequency */ |
| #define TCP_TSTAMP_RESOLUTION TCP_TICK /**< Time stamp resolution */ |
| #define TCP_PAWS_IDLE 24 * 24 * 60 * 60 * THZ /**< 24 days */ |
| #define TCP_FIB_RECHECK_PERIOD 1 * THZ /**< Recheck every 1s */ |
| #define TCP_MAX_OPTION_SPACE 40 |
| |
| #define TCP_DUPACK_THRESHOLD 3 |
| #define TCP_MAX_RX_FIFO_SIZE 32 << 20 |
| #define TCP_MIN_RX_FIFO_SIZE 4 << 10 |
| #define TCP_IW_N_SEGMENTS 10 |
| #define TCP_ALWAYS_ACK 1 /**< On/off delayed acks */ |
| #define TCP_USE_SACKS 1 /**< Disable only for testing */ |
| |
| /** TCP FSM state definitions as per RFC793. */ |
| #define foreach_tcp_fsm_state \ |
| _(CLOSED, "CLOSED") \ |
| _(LISTEN, "LISTEN") \ |
| _(SYN_SENT, "SYN_SENT") \ |
| _(SYN_RCVD, "SYN_RCVD") \ |
| _(ESTABLISHED, "ESTABLISHED") \ |
| _(CLOSE_WAIT, "CLOSE_WAIT") \ |
| _(FIN_WAIT_1, "FIN_WAIT_1") \ |
| _(LAST_ACK, "LAST_ACK") \ |
| _(CLOSING, "CLOSING") \ |
| _(FIN_WAIT_2, "FIN_WAIT_2") \ |
| _(TIME_WAIT, "TIME_WAIT") |
| |
| typedef enum _tcp_state |
| { |
| #define _(sym, str) TCP_STATE_##sym, |
| foreach_tcp_fsm_state |
| #undef _ |
| TCP_N_STATES |
| } tcp_state_t; |
| |
| format_function_t format_tcp_state; |
| format_function_t format_tcp_flags; |
| format_function_t format_tcp_sacks; |
| format_function_t format_tcp_rcv_sacks; |
| |
| /** TCP timers */ |
| #define foreach_tcp_timer \ |
| _(RETRANSMIT, "RETRANSMIT") \ |
| _(DELACK, "DELAYED ACK") \ |
| _(PERSIST, "PERSIST") \ |
| _(KEEP, "KEEP") \ |
| _(WAITCLOSE, "WAIT CLOSE") \ |
| _(RETRANSMIT_SYN, "RETRANSMIT SYN") \ |
| _(ESTABLISH, "ESTABLISH") |
| |
| typedef enum _tcp_timers |
| { |
| #define _(sym, str) TCP_TIMER_##sym, |
| foreach_tcp_timer |
| #undef _ |
| TCP_N_TIMERS |
| } tcp_timers_e; |
| |
| typedef void (timer_expiration_handler) (u32 index); |
| |
| extern timer_expiration_handler tcp_timer_delack_handler; |
| extern timer_expiration_handler tcp_timer_retransmit_handler; |
| extern timer_expiration_handler tcp_timer_persist_handler; |
| extern timer_expiration_handler tcp_timer_retransmit_syn_handler; |
| |
| #define TCP_TIMER_HANDLE_INVALID ((u32) ~0) |
| |
| /* Timer delays as multiples of 100ms */ |
| #define TCP_TO_TIMER_TICK TCP_TICK*10 /* Period for converting from TCP |
| * ticks to timer units */ |
| #define TCP_DELACK_TIME 1 /* 0.1s */ |
| #define TCP_ESTABLISH_TIME 750 /* 75s */ |
| #define TCP_SYN_RCVD_TIME 600 /* 60s */ |
| #define TCP_2MSL_TIME 300 /* 30s */ |
| #define TCP_CLOSEWAIT_TIME 20 /* 2s */ |
| #define TCP_TIMEWAIT_TIME 100 /* 10s */ |
| #define TCP_CLEANUP_TIME 10 /* 1s Time to wait before cleanup */ |
| #define TCP_TIMER_PERSIST_MIN 2 /* 0.2s */ |
| |
| #define TCP_RTO_MAX 60 * THZ /* Min max RTO (60s) as per RFC6298 */ |
| #define TCP_RTO_MIN 0.2 * THZ /* Min RTO (200ms) - lower than standard */ |
| #define TCP_RTT_MAX 30 * THZ /* 30s (probably too much) */ |
| #define TCP_RTO_SYN_RETRIES 3 /* SYN retries without doubling RTO */ |
| #define TCP_RTO_INIT 1 * THZ /* Initial retransmit timer */ |
| |
| /** TCP connection flags */ |
| #define foreach_tcp_connection_flag \ |
| _(SNDACK, "Send ACK") \ |
| _(FINSNT, "FIN sent") \ |
| _(SENT_RCV_WND0, "Sent 0 rcv_wnd") \ |
| _(RECOVERY, "Recovery") \ |
| _(FAST_RECOVERY, "Fast Recovery") \ |
| _(FR_1_SMSS, "Sent 1 SMSS") \ |
| _(HALF_OPEN_DONE, "Half-open completed") \ |
| _(FINPNDG, "FIN pending") \ |
| _(FRXT_PENDING, "Fast-retransmit pending") \ |
| _(FRXT_FIRST, "Fast-retransmit first again") \ |
| |
| typedef enum _tcp_connection_flag_bits |
| { |
| #define _(sym, str) TCP_CONN_##sym##_BIT, |
| foreach_tcp_connection_flag |
| #undef _ |
| TCP_CONN_N_FLAG_BITS |
| } tcp_connection_flag_bits_e; |
| |
| typedef enum _tcp_connection_flag |
| { |
| #define _(sym, str) TCP_CONN_##sym = 1 << TCP_CONN_##sym##_BIT, |
| foreach_tcp_connection_flag |
| #undef _ |
| TCP_CONN_N_FLAGS |
| } tcp_connection_flags_e; |
| |
| /** TCP buffer flags */ |
| #define foreach_tcp_buf_flag \ |
| _ (ACK) /**< Sending ACK. */ \ |
| _ (DUPACK) /**< Sending DUPACK. */ \ |
| |
| enum |
| { |
| #define _(f) TCP_BUF_BIT_##f, |
| foreach_tcp_buf_flag |
| #undef _ |
| TCP_N_BUF_BITS, |
| }; |
| |
| enum |
| { |
| #define _(f) TCP_BUF_FLAG_##f = 1 << TCP_BUF_BIT_##f, |
| foreach_tcp_buf_flag |
| #undef _ |
| }; |
| |
| #define TCP_SCOREBOARD_TRACE (0) |
| #define TCP_MAX_SACK_BLOCKS 256 /**< Max number of SACK blocks stored */ |
| #define TCP_INVALID_SACK_HOLE_INDEX ((u32)~0) |
| |
| typedef struct _scoreboard_trace_elt |
| { |
| u32 start; |
| u32 end; |
| u32 ack; |
| u32 snd_una_max; |
| u32 group; |
| } scoreboard_trace_elt_t; |
| |
| typedef struct _sack_scoreboard_hole |
| { |
| u32 next; /**< Index for next entry in linked list */ |
| u32 prev; /**< Index for previous entry in linked list */ |
| u32 start; /**< Start sequence number */ |
| u32 end; /**< End sequence number */ |
| u8 is_lost; /**< Mark hole as lost */ |
| } sack_scoreboard_hole_t; |
| |
| typedef struct _sack_scoreboard |
| { |
| sack_scoreboard_hole_t *holes; /**< Pool of holes */ |
| u32 head; /**< Index of first entry */ |
| u32 tail; /**< Index of last entry */ |
| u32 sacked_bytes; /**< Number of bytes sacked in sb */ |
| u32 last_sacked_bytes; /**< Number of bytes last sacked */ |
| u32 last_bytes_delivered; /**< Number of sack bytes delivered */ |
| u32 snd_una_adv; /**< Bytes to add to snd_una */ |
| u32 high_sacked; /**< Highest byte sacked (fack) */ |
| u32 high_rxt; /**< Highest retransmitted sequence */ |
| u32 rescue_rxt; /**< Rescue sequence number */ |
| u32 lost_bytes; /**< Bytes lost as per RFC6675 */ |
| u32 cur_rxt_hole; /**< Retransmitting from this hole */ |
| |
| #if TCP_SCOREBOARD_TRACE |
| scoreboard_trace_elt_t *trace; |
| #endif |
| |
| } sack_scoreboard_t; |
| |
| #if TCP_SCOREBOARD_TRACE |
| #define tcp_scoreboard_trace_add(_tc, _ack) \ |
| { \ |
| static u64 _group = 0; \ |
| sack_scoreboard_t *_sb = &_tc->sack_sb; \ |
| sack_block_t *_sack, *_sacks; \ |
| scoreboard_trace_elt_t *_elt; \ |
| int i; \ |
| _group++; \ |
| _sacks = _tc->rcv_opts.sacks; \ |
| for (i = 0; i < vec_len (_sacks); i++) \ |
| { \ |
| _sack = &_sacks[i]; \ |
| vec_add2 (_sb->trace, _elt, 1); \ |
| _elt->start = _sack->start; \ |
| _elt->end = _sack->end; \ |
| _elt->ack = _elt->end == _ack ? _ack : 0; \ |
| _elt->snd_una_max = _elt->end == _ack ? _tc->snd_una_max : 0; \ |
| _elt->group = _group; \ |
| } \ |
| } |
| #else |
| #define tcp_scoreboard_trace_add(_tc, _ack) |
| #endif |
| |
| sack_scoreboard_hole_t *scoreboard_next_rxt_hole (sack_scoreboard_t * sb, |
| sack_scoreboard_hole_t * |
| start, u8 have_sent_1_smss, |
| u8 * can_rescue, |
| u8 * snd_limited); |
| sack_scoreboard_hole_t *scoreboard_get_hole (sack_scoreboard_t * sb, |
| u32 index); |
| |
| sack_scoreboard_hole_t *scoreboard_next_hole (sack_scoreboard_t * sb, |
| sack_scoreboard_hole_t * hole); |
| sack_scoreboard_hole_t *scoreboard_prev_hole (sack_scoreboard_t * sb, |
| sack_scoreboard_hole_t * hole); |
| sack_scoreboard_hole_t *scoreboard_first_hole (sack_scoreboard_t * sb); |
| sack_scoreboard_hole_t *scoreboard_last_hole (sack_scoreboard_t * sb); |
| void scoreboard_clear (sack_scoreboard_t * sb); |
| void scoreboard_init (sack_scoreboard_t * sb); |
| u8 *format_tcp_scoreboard (u8 * s, va_list * args); |
| |
| typedef enum _tcp_cc_algorithm_type |
| { |
| TCP_CC_NEWRENO, |
| } tcp_cc_algorithm_type_e; |
| |
| typedef struct _tcp_cc_algorithm tcp_cc_algorithm_t; |
| |
| typedef enum _tcp_cc_ack_t |
| { |
| TCP_CC_ACK, |
| TCP_CC_DUPACK, |
| TCP_CC_PARTIALACK |
| } tcp_cc_ack_t; |
| |
| typedef struct _tcp_connection |
| { |
| transport_connection_t connection; /**< Common transport data. First! */ |
| |
| u8 state; /**< TCP state as per tcp_state_t */ |
| u16 flags; /**< Connection flags (see tcp_conn_flags_e) */ |
| u32 timers[TCP_N_TIMERS]; /**< Timer handles into timer wheel */ |
| |
| /* TODO RFC4898 */ |
| |
| /** Send sequence variables RFC793 */ |
| u32 snd_una; /**< oldest unacknowledged sequence number */ |
| u32 snd_una_max; /**< newest unacknowledged sequence number + 1*/ |
| u32 snd_wnd; /**< send window */ |
| u32 snd_wl1; /**< seq number used for last snd.wnd update */ |
| u32 snd_wl2; /**< ack number used for last snd.wnd update */ |
| u32 snd_nxt; /**< next seq number to be sent */ |
| u16 snd_mss; /**< Effective send max seg (data) size */ |
| |
| /** Receive sequence variables RFC793 */ |
| u32 rcv_nxt; /**< next sequence number expected */ |
| u32 rcv_wnd; /**< receive window we expect */ |
| |
| u32 rcv_las; /**< rcv_nxt at last ack sent/rcv_wnd update */ |
| u32 iss; /**< initial sent sequence */ |
| u32 irs; /**< initial remote sequence */ |
| |
| /* Options */ |
| u8 snd_opts_len; /**< Tx options len */ |
| u8 rcv_wscale; /**< Window scale to advertise to peer */ |
| u8 snd_wscale; /**< Window scale to use when sending */ |
| u32 tsval_recent; /**< Last timestamp received */ |
| u32 tsval_recent_age; /**< When last updated tstamp_recent*/ |
| tcp_options_t snd_opts; /**< Tx options for connection */ |
| tcp_options_t rcv_opts; /**< Rx options for connection */ |
| |
| sack_block_t *snd_sacks; /**< Vector of SACKs to send. XXX Fixed size? */ |
| sack_scoreboard_t sack_sb; /**< SACK "scoreboard" that tracks holes */ |
| |
| u16 rcv_dupacks; /**< Number of DUPACKs received */ |
| u8 snt_dupacks; /**< Number of DUPACKs sent in a burst */ |
| |
| /* Congestion control */ |
| u32 cwnd; /**< Congestion window */ |
| u32 cwnd_acc_bytes; /**< Bytes accumulated for cwnd increment */ |
| u32 ssthresh; /**< Slow-start threshold */ |
| u32 prev_ssthresh; /**< ssthresh before congestion */ |
| u32 prev_cwnd; /**< ssthresh before congestion */ |
| u32 bytes_acked; /**< Bytes acknowledged by current segment */ |
| u32 snd_rxt_bytes; /**< Retransmitted bytes */ |
| u32 snd_rxt_ts; /**< Timestamp when first packet is retransmitted */ |
| u32 tsecr_last_ack; /**< Timestamp echoed to us in last healthy ACK */ |
| u32 snd_congestion; /**< snd_una_max when congestion is detected */ |
| tcp_cc_algorithm_t *cc_algo; /**< Congestion control algorithm */ |
| |
| /* RTT and RTO */ |
| u32 rto; /**< Retransmission timeout */ |
| u32 rto_boff; /**< Index for RTO backoff */ |
| u32 srtt; /**< Smoothed RTT */ |
| u32 rttvar; /**< Smoothed mean RTT difference. Approximates variance */ |
| u32 rtt_seq; /**< Sequence number for tracked ACK */ |
| f64 rtt_ts; /**< Timestamp for tracked ACK */ |
| f64 mrtt_us; /**< High precision mrtt from tracked acks */ |
| |
| u16 mss; /**< Our max seg size that includes options */ |
| u32 limited_transmit; /**< snd_nxt when limited transmit starts */ |
| u32 last_fib_check; /**< Last time we checked fib route for peer */ |
| u32 sw_if_index; /**< Interface for the connection */ |
| } tcp_connection_t; |
| |
| struct _tcp_cc_algorithm |
| { |
| void (*rcv_ack) (tcp_connection_t * tc); |
| void (*rcv_cong_ack) (tcp_connection_t * tc, tcp_cc_ack_t ack); |
| void (*congestion) (tcp_connection_t * tc); |
| void (*recovered) (tcp_connection_t * tc); |
| void (*init) (tcp_connection_t * tc); |
| }; |
| |
| #define tcp_fastrecovery_on(tc) (tc)->flags |= TCP_CONN_FAST_RECOVERY |
| #define tcp_fastrecovery_off(tc) (tc)->flags &= ~TCP_CONN_FAST_RECOVERY |
| #define tcp_recovery_on(tc) (tc)->flags |= TCP_CONN_RECOVERY |
| #define tcp_recovery_off(tc) (tc)->flags &= ~TCP_CONN_RECOVERY |
| #define tcp_in_fastrecovery(tc) ((tc)->flags & TCP_CONN_FAST_RECOVERY) |
| #define tcp_in_recovery(tc) ((tc)->flags & (TCP_CONN_RECOVERY)) |
| #define tcp_in_slowstart(tc) (tc->cwnd < tc->ssthresh) |
| #define tcp_fastrecovery_sent_1_smss(tc) ((tc)->flags & TCP_CONN_FR_1_SMSS) |
| #define tcp_fastrecovery_1_smss_on(tc) ((tc)->flags |= TCP_CONN_FR_1_SMSS) |
| #define tcp_fastrecovery_1_smss_off(tc) ((tc)->flags &= ~TCP_CONN_FR_1_SMSS) |
| #define tcp_fastrecovery_first(tc) ((tc)->flags & TCP_CONN_FRXT_FIRST) |
| #define tcp_fastrecovery_first_on(tc) ((tc)->flags |= TCP_CONN_FRXT_FIRST) |
| #define tcp_fastrecovery_first_off(tc) ((tc)->flags &= ~TCP_CONN_FRXT_FIRST) |
| |
| #define tcp_in_cong_recovery(tc) ((tc)->flags & \ |
| (TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY)) |
| |
| always_inline void |
| tcp_cong_recovery_off (tcp_connection_t * tc) |
| { |
| tc->flags &= ~(TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY); |
| tcp_fastrecovery_1_smss_off (tc); |
| tcp_fastrecovery_first_off (tc); |
| } |
| |
| typedef enum _tcp_error |
| { |
| #define tcp_error(n,s) TCP_ERROR_##n, |
| #include <vnet/tcp/tcp_error.def> |
| #undef tcp_error |
| TCP_N_ERROR, |
| } tcp_error_t; |
| |
| typedef struct _tcp_lookup_dispatch |
| { |
| u8 next, error; |
| } tcp_lookup_dispatch_t; |
| |
| typedef struct tcp_worker_ctx_ |
| { |
| CLIB_CACHE_LINE_ALIGN_MARK (cacheline0); |
| u32 time_now; /**< worker time */ |
| tw_timer_wheel_16t_2w_512sl_t timer_wheel; /**< worker timer wheel */ |
| u32 *tx_buffers; /**< tx buffer free list */ |
| vlib_frame_t *tx_frames[2]; /**< tx frames for tcp 4/6 |
| output nodes */ |
| vlib_frame_t *ip_lookup_tx_frames[2]; /**< tx frames for ip 4/6 |
| lookup nodes */ |
| u32 *pending_fast_rxt; /**< vector of connections |
| needing fast rxt */ |
| u32 *ongoing_fast_rxt; /**< vector of connections |
| now doing fast rxt */ |
| u32 *postponed_fast_rxt; /**< vector of connections |
| that will do fast rxt */ |
| vlib_main_t *vm; /**< pointer to vm */ |
| |
| CLIB_CACHE_LINE_ALIGN_MARK (cacheline1); |
| u8 cached_opts[40]; /**< cached 'on the wire' |
| options for bursts */ |
| |
| } tcp_worker_ctx_t; |
| |
| typedef struct _tcp_main |
| { |
| /* Per-worker thread tcp connection pools */ |
| tcp_connection_t **connections; |
| |
| /* Pool of listeners. */ |
| tcp_connection_t *listener_pool; |
| |
| /** Dispatch table by state and flags */ |
| tcp_lookup_dispatch_t dispatch_table[TCP_N_STATES][64]; |
| |
| u8 log2_tstamp_clocks_per_tick; |
| f64 tstamp_ticks_per_clock; |
| |
| /** per-worker context */ |
| tcp_worker_ctx_t *wrk_ctx; |
| |
| /* Pool of half-open connections on which we've sent a SYN */ |
| tcp_connection_t *half_open_connections; |
| clib_spinlock_t half_open_lock; |
| |
| /* Congestion control algorithms registered */ |
| tcp_cc_algorithm_t *cc_algos; |
| |
| /** vlib buffer size */ |
| u32 bytes_per_buffer; |
| |
| /* |
| * Configuration |
| */ |
| |
| /* Flag that indicates if stack is on or off */ |
| u8 is_enabled; |
| |
| /** Max rx fifo size for a session. It is used in to compute the |
| * rfc 7323 window scaling factor */ |
| u32 max_rx_fifo; |
| |
| /** Number of preallocated connections */ |
| u32 preallocated_connections; |
| u32 preallocated_half_open_connections; |
| |
| /** Vectors of src addresses. Optional unless one needs > 63K active-opens */ |
| ip4_address_t *ip4_src_addresses; |
| u32 last_v4_address_rotor; |
| u32 last_v6_address_rotor; |
| ip6_address_t *ip6_src_addresses; |
| |
| /** Enable tx pacing for new connections */ |
| u8 tx_pacing; |
| |
| u8 punt_unknown4; |
| u8 punt_unknown6; |
| |
| /** fault-injection */ |
| f64 buffer_fail_fraction; |
| } tcp_main_t; |
| |
| extern tcp_main_t tcp_main; |
| extern vlib_node_registration_t tcp4_input_node; |
| extern vlib_node_registration_t tcp6_input_node; |
| extern vlib_node_registration_t tcp4_output_node; |
| extern vlib_node_registration_t tcp6_output_node; |
| |
| always_inline tcp_main_t * |
| vnet_get_tcp_main () |
| { |
| return &tcp_main; |
| } |
| |
| always_inline tcp_worker_ctx_t * |
| tcp_get_worker (u32 thread_index) |
| { |
| return &tcp_main.wrk_ctx[thread_index]; |
| } |
| |
| always_inline tcp_header_t * |
| tcp_buffer_hdr (vlib_buffer_t * b) |
| { |
| ASSERT ((signed) b->current_data >= (signed) -VLIB_BUFFER_PRE_DATA_SIZE); |
| return (tcp_header_t *) (b->data + b->current_data |
| + vnet_buffer (b)->tcp.hdr_offset); |
| } |
| |
| #if (VLIB_BUFFER_TRACE_TRAJECTORY) |
| #define tcp_trajectory_add_start(b, start) \ |
| { \ |
| (*vlib_buffer_trace_trajectory_cb) (b, start); \ |
| } |
| #else |
| #define tcp_trajectory_add_start(b, start) |
| #endif |
| |
| clib_error_t *vnet_tcp_enable_disable (vlib_main_t * vm, u8 is_en); |
| |
| void tcp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add); |
| |
| always_inline tcp_connection_t * |
| tcp_connection_get (u32 conn_index, u32 thread_index) |
| { |
| if (PREDICT_FALSE |
| (pool_is_free_index (tcp_main.connections[thread_index], conn_index))) |
| return 0; |
| return pool_elt_at_index (tcp_main.connections[thread_index], conn_index); |
| } |
| |
| always_inline tcp_connection_t * |
| tcp_connection_get_if_valid (u32 conn_index, u32 thread_index) |
| { |
| if (tcp_main.connections[thread_index] == 0) |
| return 0; |
| if (pool_is_free_index (tcp_main.connections[thread_index], conn_index)) |
| return 0; |
| return pool_elt_at_index (tcp_main.connections[thread_index], conn_index); |
| } |
| |
| always_inline tcp_connection_t * |
| tcp_get_connection_from_transport (transport_connection_t * tconn) |
| { |
| return (tcp_connection_t *) tconn; |
| } |
| |
| void tcp_connection_close (tcp_connection_t * tc); |
| void tcp_connection_cleanup (tcp_connection_t * tc); |
| void tcp_connection_del (tcp_connection_t * tc); |
| int tcp_half_open_connection_cleanup (tcp_connection_t * tc); |
| tcp_connection_t *tcp_connection_new (u8 thread_index); |
| void tcp_connection_reset (tcp_connection_t * tc); |
| int tcp_configure_v4_source_address_range (vlib_main_t * vm, |
| ip4_address_t * start, |
| ip4_address_t * end, u32 table_id); |
| int tcp_configure_v6_source_address_range (vlib_main_t * vm, |
| ip6_address_t * start, |
| ip6_address_t * end, u32 table_id); |
| void tcp_api_reference (void); |
| u8 *format_tcp_connection (u8 * s, va_list * args); |
| |
| always_inline tcp_connection_t * |
| tcp_listener_get (u32 tli) |
| { |
| return pool_elt_at_index (tcp_main.listener_pool, tli); |
| } |
| |
| always_inline tcp_connection_t * |
| tcp_half_open_connection_get (u32 conn_index) |
| { |
| tcp_connection_t *tc = 0; |
| clib_spinlock_lock_if_init (&tcp_main.half_open_lock); |
| if (!pool_is_free_index (tcp_main.half_open_connections, conn_index)) |
| tc = pool_elt_at_index (tcp_main.half_open_connections, conn_index); |
| clib_spinlock_unlock_if_init (&tcp_main.half_open_lock); |
| return tc; |
| } |
| |
| void tcp_make_ack (tcp_connection_t * ts, vlib_buffer_t * b); |
| void tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b); |
| void tcp_make_synack (tcp_connection_t * ts, vlib_buffer_t * b); |
| void tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, |
| u8 is_ip4); |
| void tcp_send_reset (tcp_connection_t * tc); |
| void tcp_send_syn (tcp_connection_t * tc); |
| void tcp_send_fin (tcp_connection_t * tc); |
| void tcp_init_mss (tcp_connection_t * tc); |
| void tcp_update_burst_snd_vars (tcp_connection_t * tc); |
| void tcp_update_rto (tcp_connection_t * tc); |
| void tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4); |
| void tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk); |
| void tcp_program_fastretransmit (tcp_worker_ctx_t * wrk, |
| tcp_connection_t * tc); |
| void tcp_do_fastretransmits (tcp_worker_ctx_t * wrk); |
| |
| always_inline u32 |
| tcp_end_seq (tcp_header_t * th, u32 len) |
| { |
| return th->seq_number + tcp_is_syn (th) + tcp_is_fin (th) + len; |
| } |
| |
| /* Modulo arithmetic for TCP sequence numbers */ |
| #define seq_lt(_s1, _s2) ((i32)((_s1)-(_s2)) < 0) |
| #define seq_leq(_s1, _s2) ((i32)((_s1)-(_s2)) <= 0) |
| #define seq_gt(_s1, _s2) ((i32)((_s1)-(_s2)) > 0) |
| #define seq_geq(_s1, _s2) ((i32)((_s1)-(_s2)) >= 0) |
| #define seq_max(_s1, _s2) (seq_gt((_s1), (_s2)) ? (_s1) : (_s2)) |
| |
| /* Modulo arithmetic for timestamps */ |
| #define timestamp_lt(_t1, _t2) ((i32)((_t1)-(_t2)) < 0) |
| #define timestamp_leq(_t1, _t2) ((i32)((_t1)-(_t2)) <= 0) |
| |
| /** |
| * Our estimate of the number of bytes that have left the network |
| */ |
| always_inline u32 |
| tcp_bytes_out (const tcp_connection_t * tc) |
| { |
| if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
| return tc->sack_sb.sacked_bytes + tc->sack_sb.lost_bytes; |
| else |
| return tc->rcv_dupacks * tc->snd_mss; |
| } |
| |
| /** |
| * Our estimate of the number of bytes in flight (pipe size) |
| */ |
| always_inline u32 |
| tcp_flight_size (const tcp_connection_t * tc) |
| { |
| int flight_size; |
| |
| flight_size = (int) (tc->snd_una_max - tc->snd_una) - tcp_bytes_out (tc) |
| + tc->snd_rxt_bytes; |
| |
| if (flight_size < 0) |
| { |
| if (0) |
| clib_warning |
| ("Negative: %u %u %u dupacks %u sacked bytes %u flags %d", |
| tc->snd_una_max - tc->snd_una, tcp_bytes_out (tc), |
| tc->snd_rxt_bytes, tc->rcv_dupacks, tc->sack_sb.sacked_bytes, |
| tc->rcv_opts.flags); |
| return 0; |
| } |
| |
| return flight_size; |
| } |
| |
| /** |
| * Initial cwnd as per RFC5681 |
| */ |
| always_inline u32 |
| tcp_initial_cwnd (const tcp_connection_t * tc) |
| { |
| if (tc->snd_mss > 2190) |
| return 2 * tc->snd_mss; |
| else if (tc->snd_mss > 1095) |
| return 3 * tc->snd_mss; |
| else |
| return 4 * tc->snd_mss; |
| } |
| |
| always_inline u32 |
| tcp_loss_wnd (const tcp_connection_t * tc) |
| { |
| return tc->snd_mss; |
| } |
| |
| always_inline u32 |
| tcp_available_snd_wnd (const tcp_connection_t * tc) |
| { |
| return clib_min (tc->cwnd, tc->snd_wnd); |
| } |
| |
| always_inline u32 |
| tcp_available_output_snd_space (const tcp_connection_t * tc) |
| { |
| u32 available_wnd = tcp_available_snd_wnd (tc); |
| int flight_size = (int) (tc->snd_nxt - tc->snd_una); |
| |
| if (available_wnd <= flight_size) |
| return 0; |
| |
| return available_wnd - flight_size; |
| } |
| |
| /** |
| * Estimate of how many bytes we can still push into the network |
| */ |
| always_inline u32 |
| tcp_available_cc_snd_space (const tcp_connection_t * tc) |
| { |
| u32 available_wnd = tcp_available_snd_wnd (tc); |
| u32 flight_size = tcp_flight_size (tc); |
| |
| if (available_wnd <= flight_size) |
| return 0; |
| |
| return available_wnd - flight_size; |
| } |
| |
| always_inline u8 |
| tcp_is_lost_fin (tcp_connection_t * tc) |
| { |
| if ((tc->flags & TCP_CONN_FINSNT) && tc->snd_una_max - tc->snd_una == 1) |
| return 1; |
| return 0; |
| } |
| |
| u32 tcp_snd_space (tcp_connection_t * tc); |
| int tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, |
| tcp_connection_t * tc); |
| int tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, |
| tcp_connection_t * tc, u32 burst_size); |
| int tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| u32 burst_size); |
| int tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| u32 burst_size); |
| void tcp_cc_init_congestion (tcp_connection_t * tc); |
| void tcp_cc_fastrecovery_exit (tcp_connection_t * tc); |
| |
| fib_node_index_t tcp_lookup_rmt_in_fib (tcp_connection_t * tc); |
| |
| /* Made public for unit testing only */ |
| void tcp_update_sack_list (tcp_connection_t * tc, u32 start, u32 end); |
| u32 tcp_sack_list_bytes (tcp_connection_t * tc); |
| |
| always_inline u32 |
| tcp_time_now (void) |
| { |
| return tcp_main.wrk_ctx[vlib_get_thread_index ()].time_now; |
| } |
| |
| always_inline u32 |
| tcp_time_now_w_thread (u32 thread_index) |
| { |
| return tcp_main.wrk_ctx[thread_index].time_now; |
| } |
| |
| always_inline f64 |
| tcp_time_now_us (u32 thread_index) |
| { |
| return transport_time_now (thread_index); |
| } |
| |
| always_inline u32 |
| tcp_set_time_now (tcp_worker_ctx_t * wrk) |
| { |
| wrk->time_now = clib_cpu_time_now () * tcp_main.tstamp_ticks_per_clock; |
| return wrk->time_now; |
| } |
| |
| u32 tcp_push_header (tcp_connection_t * tconn, vlib_buffer_t * b); |
| |
| void tcp_connection_timers_init (tcp_connection_t * tc); |
| void tcp_connection_timers_reset (tcp_connection_t * tc); |
| void tcp_init_snd_vars (tcp_connection_t * tc); |
| void tcp_connection_init_vars (tcp_connection_t * tc); |
| void tcp_update_pacer (tcp_connection_t * tc); |
| |
| always_inline void |
| tcp_cc_rcv_ack (tcp_connection_t * tc) |
| { |
| tc->cc_algo->rcv_ack (tc); |
| tc->tsecr_last_ack = tc->rcv_opts.tsecr; |
| tcp_update_pacer (tc); |
| } |
| |
| always_inline void |
| tcp_connection_force_ack (tcp_connection_t * tc, vlib_buffer_t * b) |
| { |
| /* Reset flags, make sure ack is sent */ |
| tc->flags = TCP_CONN_SNDACK; |
| vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK; |
| } |
| |
| always_inline void |
| tcp_timer_set (tcp_connection_t * tc, u8 timer_id, u32 interval) |
| { |
| ASSERT (tc->c_thread_index == vlib_get_thread_index ()); |
| ASSERT (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID); |
| tc->timers[timer_id] = |
| tw_timer_start_16t_2w_512sl (&tcp_main. |
| wrk_ctx[tc->c_thread_index].timer_wheel, |
| tc->c_c_index, timer_id, interval); |
| } |
| |
| always_inline void |
| tcp_timer_reset (tcp_connection_t * tc, u8 timer_id) |
| { |
| ASSERT (tc->c_thread_index == vlib_get_thread_index ()); |
| if (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID) |
| return; |
| |
| tw_timer_stop_16t_2w_512sl (&tcp_main. |
| wrk_ctx[tc->c_thread_index].timer_wheel, |
| tc->timers[timer_id]); |
| tc->timers[timer_id] = TCP_TIMER_HANDLE_INVALID; |
| } |
| |
| always_inline void |
| tcp_timer_update (tcp_connection_t * tc, u8 timer_id, u32 interval) |
| { |
| ASSERT (tc->c_thread_index == vlib_get_thread_index ()); |
| if (tc->timers[timer_id] != TCP_TIMER_HANDLE_INVALID) |
| tw_timer_update_16t_2w_512sl (&tcp_main. |
| wrk_ctx[tc->c_thread_index].timer_wheel, |
| tc->timers[timer_id], interval); |
| else |
| tc->timers[timer_id] = |
| tw_timer_start_16t_2w_512sl (&tcp_main. |
| wrk_ctx[tc->c_thread_index].timer_wheel, |
| tc->c_c_index, timer_id, interval); |
| } |
| |
| always_inline void |
| tcp_retransmit_timer_set (tcp_connection_t * tc) |
| { |
| ASSERT (tc->snd_una != tc->snd_una_max); |
| tcp_timer_set (tc, TCP_TIMER_RETRANSMIT, |
| clib_max (tc->rto * TCP_TO_TIMER_TICK, 1)); |
| } |
| |
| always_inline void |
| tcp_retransmit_timer_reset (tcp_connection_t * tc) |
| { |
| tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT); |
| } |
| |
| always_inline void |
| tcp_retransmit_timer_force_update (tcp_connection_t * tc) |
| { |
| tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, |
| clib_max (tc->rto * TCP_TO_TIMER_TICK, 1)); |
| } |
| |
| always_inline void |
| tcp_persist_timer_set (tcp_connection_t * tc) |
| { |
| /* Reuse RTO. It's backed off in handler */ |
| tcp_timer_set (tc, TCP_TIMER_PERSIST, |
| clib_max (tc->rto * TCP_TO_TIMER_TICK, |
| TCP_TIMER_PERSIST_MIN)); |
| } |
| |
| always_inline void |
| tcp_persist_timer_update (tcp_connection_t * tc) |
| { |
| tcp_timer_update (tc, TCP_TIMER_PERSIST, |
| clib_max (tc->rto * TCP_TO_TIMER_TICK, |
| TCP_TIMER_PERSIST_MIN)); |
| } |
| |
| always_inline void |
| tcp_persist_timer_reset (tcp_connection_t * tc) |
| { |
| tcp_timer_reset (tc, TCP_TIMER_PERSIST); |
| } |
| |
| always_inline void |
| tcp_retransmit_timer_update (tcp_connection_t * tc) |
| { |
| if (tc->snd_una == tc->snd_una_max) |
| { |
| tcp_retransmit_timer_reset (tc); |
| if (tc->snd_wnd < tc->snd_mss) |
| tcp_persist_timer_update (tc); |
| } |
| else |
| tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, |
| clib_max (tc->rto * TCP_TO_TIMER_TICK, 1)); |
| } |
| |
| always_inline u8 |
| tcp_timer_is_active (tcp_connection_t * tc, tcp_timers_e timer) |
| { |
| return tc->timers[timer] != TCP_TIMER_HANDLE_INVALID; |
| } |
| |
| #define tcp_validate_txf_size(_tc, _a) \ |
| ASSERT(_tc->state != TCP_STATE_ESTABLISHED \ |
| || session_tx_fifo_max_dequeue (&_tc->connection) >= _a) |
| |
| void tcp_rcv_sacks (tcp_connection_t * tc, u32 ack); |
| u8 *tcp_scoreboard_replay (u8 * s, tcp_connection_t * tc, u8 verbose); |
| |
| void tcp_cc_algo_register (tcp_cc_algorithm_type_e type, |
| const tcp_cc_algorithm_t * vft); |
| |
| tcp_cc_algorithm_t *tcp_cc_algo_get (tcp_cc_algorithm_type_e type); |
| |
| /** |
| * Push TCP header to buffer |
| * |
| * @param vm - vlib_main |
| * @param b - buffer to write the header to |
| * @param sp_net - source port net order |
| * @param dp_net - destination port net order |
| * @param seq - sequence number net order |
| * @param ack - ack number net order |
| * @param tcp_hdr_opts_len - header and options length in bytes |
| * @param flags - header flags |
| * @param wnd - window size |
| * |
| * @return - pointer to start of TCP header |
| */ |
| always_inline void * |
| vlib_buffer_push_tcp_net_order (vlib_buffer_t * b, u16 sp, u16 dp, u32 seq, |
| u32 ack, u8 tcp_hdr_opts_len, u8 flags, |
| u16 wnd) |
| { |
| tcp_header_t *th; |
| |
| th = vlib_buffer_push_uninit (b, tcp_hdr_opts_len); |
| |
| th->src_port = sp; |
| th->dst_port = dp; |
| th->seq_number = seq; |
| th->ack_number = ack; |
| th->data_offset_and_reserved = (tcp_hdr_opts_len >> 2) << 4; |
| th->flags = flags; |
| th->window = wnd; |
| th->checksum = 0; |
| th->urgent_pointer = 0; |
| return th; |
| } |
| |
| /** |
| * Push TCP header to buffer |
| * |
| * @param b - buffer to write the header to |
| * @param sp_net - source port net order |
| * @param dp_net - destination port net order |
| * @param seq - sequence number host order |
| * @param ack - ack number host order |
| * @param tcp_hdr_opts_len - header and options length in bytes |
| * @param flags - header flags |
| * @param wnd - window size |
| * |
| * @return - pointer to start of TCP header |
| */ |
| always_inline void * |
| vlib_buffer_push_tcp (vlib_buffer_t * b, u16 sp_net, u16 dp_net, u32 seq, |
| u32 ack, u8 tcp_hdr_opts_len, u8 flags, u16 wnd) |
| { |
| return vlib_buffer_push_tcp_net_order (b, sp_net, dp_net, |
| clib_host_to_net_u32 (seq), |
| clib_host_to_net_u32 (ack), |
| tcp_hdr_opts_len, flags, |
| clib_host_to_net_u16 (wnd)); |
| } |
| |
| #endif /* _vnet_tcp_h_ */ |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |